/*
 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.imageio.plugins.common;

import java.awt.color.ColorSpace;

/**
 * A dummy <code>ColorSpace</code> to enable <code>ColorModel</code>
 * for image data which do not have an innate color representation.
 */
public class BogusColorSpace extends ColorSpace {

  /**
   * Return the type given the number of components.
   *
   * @param numComponents The number of components in the <code>ColorSpace</code>.
   * @throws IllegalArgumentException if <code>numComponents</code> is less than 1.
   */
  private static int getType(int numComponents) {
    if (numComponents < 1) {
      throw new IllegalArgumentException("numComponents < 1!");
    }

    int type;
    switch (numComponents) {
      case 1:
        type = ColorSpace.TYPE_GRAY;
        break;
      default:
        // Based on the constant definitions TYPE_2CLR=12 through
        // TYPE_FCLR=25. This will return unknown types for
        // numComponents > 15.
        type = numComponents + 10;
    }

    return type;
  }

  /**
   * Constructs a bogus <code>ColorSpace</code>.
   *
   * @param numComponents The number of components in the <code>ColorSpace</code>.
   * @throws IllegalArgumentException if <code>numComponents</code> is less than 1.
   */
  public BogusColorSpace(int numComponents) {
    super(getType(numComponents), numComponents);
  }

  //
  // The following methods simply copy the input array to the
  // output array while otherwise attempting to adhere to the
  // specified behavior of the methods vis-a-vis exceptions.
  //

  public float[] toRGB(float[] colorvalue) {
    if (colorvalue.length < getNumComponents()) {
      throw new ArrayIndexOutOfBoundsException
          ("colorvalue.length < getNumComponents()");
    }

    float[] rgbvalue = new float[3];

    System.arraycopy(colorvalue, 0, rgbvalue, 0,
        Math.min(3, getNumComponents()));

    return colorvalue;
  }

  public float[] fromRGB(float[] rgbvalue) {
    if (rgbvalue.length < 3) {
      throw new ArrayIndexOutOfBoundsException
          ("rgbvalue.length < 3");
    }

    float[] colorvalue = new float[getNumComponents()];

    System.arraycopy(rgbvalue, 0, colorvalue, 0,
        Math.min(3, colorvalue.length));

    return rgbvalue;
  }

  public float[] toCIEXYZ(float[] colorvalue) {
    if (colorvalue.length < getNumComponents()) {
      throw new ArrayIndexOutOfBoundsException
          ("colorvalue.length < getNumComponents()");
    }

    float[] xyzvalue = new float[3];

    System.arraycopy(colorvalue, 0, xyzvalue, 0,
        Math.min(3, getNumComponents()));

    return colorvalue;
  }

  public float[] fromCIEXYZ(float[] xyzvalue) {
    if (xyzvalue.length < 3) {
      throw new ArrayIndexOutOfBoundsException
          ("xyzvalue.length < 3");
    }

    float[] colorvalue = new float[getNumComponents()];

    System.arraycopy(xyzvalue, 0, colorvalue, 0,
        Math.min(3, colorvalue.length));

    return xyzvalue;
  }
}
